With the concurrent emphasis on accountability, prevention, and early intervention, curriculum-based measurement of reading (R-CBM) is playing an increasingly important role in the educational process. This study investigated the differences in diagnostic accuracy and utility between commercial norms and local norms when making high-stakes, local decisions. Scores on Dynamic Indicators of Early Literacy Skills Oral Reading Fluency for 1,374 students in Grades 2 to 5 were used to predict outcomes the Georgia reading achievement test, the Criterion Referenced Competency Tests. Local norms were generated using logistic regression and receiver operator characteristic curve analysis. The generated cut scores were compared to the commercial norms for differences in diagnostic efficiency. The generated cut scores were lower than the commercial norms and had improved diagnostic efficiency. Implications related to educational policy and the use of R-CBM are discussed.